1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright 2011-2014 Autronica Fire and Security AS
*
* Author(s):
* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
*
* include file for HSR and PRP.
*/
#ifndef __HSR_PRIVATE_H
#define __HSR_PRIVATE_H
#include <linux/netdevice.h>
#include <linux/list.h>
/* Time constants as specified in the HSR specification (IEC-62439-3 2010)
* Table 8.
* All values in milliseconds.
*/
#define HSR_LIFE_CHECK_INTERVAL 2000 /* ms */
#define HSR_NODE_FORGET_TIME 60000 /* ms */
#define HSR_ANNOUNCE_INTERVAL 100 /* ms */
/* By how much may slave1 and slave2 timestamps of latest received frame from
* each node differ before we notify of communication problem?
*/
#define MAX_SLAVE_DIFF 3000 /* ms */
#define HSR_SEQNR_START (USHRT_MAX - 1024)
#define HSR_SUP_SEQNR_START (HSR_SEQNR_START / 2)
/* How often shall we check for broken ring and remove node entries older than
* HSR_NODE_FORGET_TIME?
*/
#define PRUNE_PERIOD 3000 /* ms */
#define HSR_TLV_ANNOUNCE 22
#define HSR_TLV_LIFE_CHECK 23
/* PRP V1 life check for Duplicate discard */
#define PRP_TLV_LIFE_CHECK_DD 20
/* PRP V1 life check for Duplicate Accept */
#define PRP_TLV_LIFE_CHECK_DA 21
/* HSR Tag.
* As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB,
* path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest,
* h_source, h_proto = 0x88FB }, and add { path, LSDU_size, sequence Nr,
* encapsulated protocol } instead.
*
* Field names as defined in the IEC:2010 standard for HSR.
*/
struct hsr_tag {
__be16 path_and_LSDU_size;
__be16 sequence_nr;
__be16 encap_proto;
} __packed;
#define HSR_HLEN 6
#define HSR_V1_SUP_LSDUSIZE 52
/* The helper functions below assumes that 'path' occupies the 4 most
* significant bits of the 16-bit field shared by 'path' and 'LSDU_size' (or
* equivalently, the 4 most significant bits of HSR tag byte 14).
*
* This is unclear in the IEC specification; its definition of MAC addresses
* indicates the spec is written with the least significant bit first (to the
* left). This, however, would mean that the LSDU field would be split in two
* with the path field in-between, which seems strange. I'm guessing the MAC
* address definition is in error.
*/
static inline void set_hsr_tag_path(struct hsr_tag *ht, u16 path)
{
ht->path_and_LSDU_size =
htons((ntohs(ht->path_and_LSDU_size) & 0x0FFF) | (path << 12));
}
static inline void set_hsr_tag_LSDU_size(struct hsr_tag *ht, u16 LSDU_size)
{
ht->path_and_LSDU_size = htons((ntohs(ht->path_and_LSDU_size) &
0xF000) | (LSDU_size & 0x0FFF));
}
struct hsr_ethhdr {
struct ethhdr ethhdr;
struct hsr_tag hsr_tag;
} __packed;
/* HSR Supervision Frame data types.
* Field names as defined in the IEC:2010 standard for HSR.
*/
struct hsr_sup_tag {
__be16 path_and_HSR_ver;
__be16 sequence_nr;
__u8 HSR_TLV_type;
__u8 HSR_TLV_length;
} __packed;
struct hsr_sup_payload {
unsigned char macaddress_A[ETH_ALEN];
} __packed;
static inline void set_hsr_stag_path(struct hsr_sup_tag *hst, u16 path)
{
set_hsr_tag_path((struct hsr_tag *)hst, path);
}
static inline void set_hsr_stag_HSR_ver(struct hsr_sup_tag *hst, u16 HSR_ver)
{
set_hsr_tag_LSDU_size((struct hsr_tag *)hst, HSR_ver);
}
struct hsrv0_ethhdr_sp {
struct ethhdr ethhdr;
struct hsr_sup_tag hsr_sup;
} __packed;
struct hsrv1_ethhdr_sp {
struct ethhdr ethhdr;
struct hsr_tag hsr;
struct hsr_sup_tag hsr_sup;
} __packed;
enum hsr_port_type {
HSR_PT_NONE = 0, /* Must be 0, used by framereg */
HSR_PT_SLAVE_A,
HSR_PT_SLAVE_B,
HSR_PT_INTERLINK,
HSR_PT_MASTER,
HSR_PT_PORTS, /* This must be the last item in the enum */
};
/* PRP Redunancy Control Trailor (RCT).
* As defined in IEC-62439-4:2012, the PRP RCT is really { sequence Nr,
* Lan indentifier (LanId), LSDU_size and PRP_suffix = 0x88FB }.
*
* Field names as defined in the IEC:2012 standard for PRP.
*/
struct prp_rct {
__be16 sequence_nr;
__be16 lan_id_and_LSDU_size;
__be16 PRP_suffix;
} __packed;
static inline void set_prp_LSDU_size(struct prp_rct *rct, u16 LSDU_size)
{
rct->lan_id_and_LSDU_size = htons((ntohs(rct->lan_id_and_LSDU_size) &
0xF000) | (LSDU_size & 0x0FFF));
}
struct hsr_port {
struct list_head port_list;
struct net_device *dev;
struct hsr_priv *hsr;
enum hsr_port_type type;
};
/* used by driver internally to differentiate various protocols */
enum hsr_version {
HSR_V0 = 0,
HSR_V1,
PRP_V1,
};
struct hsr_frame_info;
struct hsr_proto_ops {
/* format and send supervision frame */
void (*send_sv_frame)(struct hsr_port *port, unsigned long *interval);
struct sk_buff * (*get_untagged_frame)(struct hsr_frame_info *frame,
struct hsr_port *port);
struct sk_buff * (*create_tagged_frame)(struct hsr_frame_info *frame,
struct hsr_port *port);
void (*fill_frame_info)(__be16 proto, struct sk_buff *skb,
struct hsr_frame_info *frame);
};
struct hsr_priv {
struct rcu_head rcu_head;
struct list_head ports;
struct list_head node_db; /* Known HSR nodes */
struct list_head self_node_db; /* MACs of slaves */
struct timer_list announce_timer; /* Supervision frame dispatch */
struct timer_list prune_timer;
int announce_count;
u16 sequence_nr;
u16 sup_sequence_nr; /* For HSRv1 separate seq_nr for supervision */
enum hsr_version prot_version; /* Indicate if HSRv0, HSRv1 or PRPv1 */
spinlock_t seqnr_lock; /* locking for sequence_nr */
spinlock_t list_lock; /* locking for node list */
struct hsr_proto_ops *proto_ops;
unsigned char sup_multicast_addr[ETH_ALEN];
#ifdef CONFIG_DEBUG_FS
struct dentry *node_tbl_root;
#endif
};
#define hsr_for_each_port(hsr, port) \
list_for_each_entry_rcu((port), &(hsr)->ports, port_list)
struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt);
/* Caller must ensure skb is a valid HSR frame */
static inline u16 hsr_get_skb_sequence_nr(struct sk_buff *skb)
{
struct hsr_ethhdr *hsr_ethhdr;
hsr_ethhdr = (struct hsr_ethhdr *)skb_mac_header(skb);
return ntohs(hsr_ethhdr->hsr_tag.sequence_nr);
}
#if IS_ENABLED(CONFIG_DEBUG_FS)
void hsr_debugfs_rename(struct net_device *dev);
void hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev);
void hsr_debugfs_term(struct hsr_priv *priv);
void hsr_debugfs_create_root(void);
void hsr_debugfs_remove_root(void);
#else
static inline void hsr_debugfs_rename(struct net_device *dev)
{
}
static inline void hsr_debugfs_init(struct hsr_priv *priv,
struct net_device *hsr_dev)
{}
static inline void hsr_debugfs_term(struct hsr_priv *priv)
{}
static inline void hsr_debugfs_create_root(void)
{}
static inline void hsr_debugfs_remove_root(void)
{}
#endif
#endif /* __HSR_PRIVATE_H */
|
